via-pmu.c

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	return PBOOK_SLEEP_OK;
}
#endif /* CONFIG_PM */

int
pmu_register_sleep_notifier(struct pmu_sleep_notifier *n)
{
	struct list_head *list;
	struct pmu_sleep_notifier *notifier;

	for (list = sleep_notifiers.next; list != &sleep_notifiers;
	     list = list->next) {
		notifier = list_entry(list, struct pmu_sleep_notifier, list);
		if (n->priority > notifier->priority)
			break;
	}
	__list_add(&n->list, list->prev, list);
	return 0;
}

int
pmu_unregister_sleep_notifier(struct pmu_sleep_notifier* n)
{
	if (n->list.next == 0)
		return -ENOENT;
	list_del(&n->list);
	n->list.next = 0;
	return 0;
}

/* Sleep is broadcast last-to-first */
static int
broadcast_sleep(int when, int fallback)
{
	int ret = PBOOK_SLEEP_OK;
	struct list_head *list;
	struct pmu_sleep_notifier *notifier;

	for (list = sleep_notifiers.prev; list != &sleep_notifiers;
	     list = list->prev) {
		notifier = list_entry(list, struct pmu_sleep_notifier, list);
		ret = notifier->notifier_call(notifier, when);
		if (ret != PBOOK_SLEEP_OK) {
			printk(KERN_DEBUG "sleep %d rejected by %p (%p)\n",
			       when, notifier, notifier->notifier_call);
			for (; list != &sleep_notifiers; list = list->next) {
				notifier = list_entry(list, struct pmu_sleep_notifier, list);
				notifier->notifier_call(notifier, fallback);
			}
			return ret;
		}
	}
	return ret;
}

/* Wake is broadcast first-to-last */
static int
broadcast_wake(void)
{
	int ret = PBOOK_SLEEP_OK;
	struct list_head *list;
	struct pmu_sleep_notifier *notifier;

	for (list = sleep_notifiers.next; list != &sleep_notifiers;
	     list = list->next) {
		notifier = list_entry(list, struct pmu_sleep_notifier, list);
		notifier->notifier_call(notifier, PBOOK_WAKE);
	}
	return ret;
}

/*
 * This struct is used to store config register values for
 * PCI devices which may get powered off when we sleep.
 */
static struct pci_save {
#ifndef HACKED_PCI_SAVE
	u16	command;
	u16	cache_lat;
	u16	intr;
	u32	rom_address;
#else
	u32	config[16];
#endif	
} *pbook_pci_saves;
static int n_pbook_pci_saves;

static void __openfirmware
pbook_pci_save(void)
{
	int npci;
	struct pci_dev *pd;
	struct pci_save *ps;

	npci = 0;
	pci_for_each_dev(pd) {
		++npci;
	}
	n_pbook_pci_saves = npci;
	if (npci == 0)
		return;
	ps = (struct pci_save *) kmalloc(npci * sizeof(*ps), GFP_KERNEL);
	pbook_pci_saves = ps;
	if (ps == NULL)
		return;

	pci_for_each_dev(pd) {
#ifndef HACKED_PCI_SAVE
		pci_read_config_word(pd, PCI_COMMAND, &ps->command);
		pci_read_config_word(pd, PCI_CACHE_LINE_SIZE, &ps->cache_lat);
		pci_read_config_word(pd, PCI_INTERRUPT_LINE, &ps->intr);
		pci_read_config_dword(pd, PCI_ROM_ADDRESS, &ps->rom_address);
#else
		int i;
		for (i=1;i<16;i++)
			pci_read_config_dword(pd, i<<4, &ps->config[i]);
#endif
		++ps;
	}
}

/* For this to work, we must take care of a few things: If gmac was enabled
 * during boot, it will be in the pci dev list. If it's disabled at this point
 * (and it will probably be), then you can't access it's config space.
 */
static void __openfirmware
pbook_pci_restore(void)
{
	u16 cmd;
	struct pci_save *ps = pbook_pci_saves - 1;
	struct pci_dev *pd;
	int j;

	pci_for_each_dev(pd) {
#ifdef HACKED_PCI_SAVE
		int i;
		ps++;
		for (i=2;i<16;i++)
			pci_write_config_dword(pd, i<<4, ps->config[i]);
		pci_write_config_dword(pd, 4, ps->config[1]);
#else
		if (ps->command == 0)
			continue;
		pci_read_config_word(pd, PCI_COMMAND, &cmd);
		if ((ps->command & ~cmd) == 0)
			continue;
		switch (pd->hdr_type) {
		case PCI_HEADER_TYPE_NORMAL:
			for (j = 0; j < 6; ++j)
				pci_write_config_dword(pd,
					PCI_BASE_ADDRESS_0 + j*4,
					pd->resource[j].start);
			pci_write_config_dword(pd, PCI_ROM_ADDRESS,
				ps->rom_address);
			pci_write_config_word(pd, PCI_CACHE_LINE_SIZE,
				ps->cache_lat);
			pci_write_config_word(pd, PCI_INTERRUPT_LINE,
				ps->intr);
			pci_write_config_word(pd, PCI_COMMAND, ps->command);
			break;
		}
#endif	
	}
}

#ifdef DEBUG_SLEEP
/* N.B. This doesn't work on the 3400 */
void
pmu_blink(int n)
{
	struct adb_request req;

	memset(&req, 0, sizeof(req));

	for (; n > 0; --n) {
		req.nbytes = 4;
		req.done = NULL;
		req.data[0] = 0xee;
		req.data[1] = 4;
		req.data[2] = 0;
		req.data[3] = 1;
		req.reply[0] = ADB_RET_OK;
		req.reply_len = 1;
		req.reply_expected = 0;
		pmu_polled_request(&req);
		mdelay(50);
		req.nbytes = 4;
		req.done = NULL;
		req.data[0] = 0xee;
		req.data[1] = 4;
		req.data[2] = 0;
		req.data[3] = 0;
		req.reply[0] = ADB_RET_OK;
		req.reply_len = 1;
		req.reply_expected = 0;
		pmu_polled_request(&req);
		mdelay(50);
	}
	mdelay(50);
}
#endif

/*
 * Put the powerbook to sleep.
 */
 
static u32 save_via[8];
static void save_via_state(void)
{
	save_via[0] = in_8(&via[ANH]);
	save_via[1] = in_8(&via[DIRA]);
	save_via[2] = in_8(&via[B]);
	save_via[3] = in_8(&via[DIRB]);
	save_via[4] = in_8(&via[PCR]);
	save_via[5] = in_8(&via[ACR]);
	save_via[6] = in_8(&via[T1CL]);
	save_via[7] = in_8(&via[T1CH]);
}
static void restore_via_state(void)
{
	out_8(&via[ANH], save_via[0]);
	out_8(&via[DIRA], save_via[1]);
	out_8(&via[B], save_via[2]);
	out_8(&via[DIRB], save_via[3]);
	out_8(&via[PCR], save_via[4]);
	out_8(&via[ACR], save_via[5]);
	out_8(&via[T1CL], save_via[6]);
	out_8(&via[T1CH], save_via[7]);
	out_8(&via[IER], IER_CLR | 0x7f);	/* disable all intrs */
	out_8(&via[IFR], 0x7f);				/* clear IFR */
	out_8(&via[IER], IER_SET | SR_INT | CB1_INT);
}

static inline void wakeup_decrementer(void)
{
	set_dec(tb_ticks_per_jiffy);
	/* No currently-supported powerbook has a 601,
	 * so use get_tbl, not native
	 */
	last_jiffy_stamp(0) = tb_last_stamp = get_tbl();
}

#define	GRACKLE_PM	(1<<7)
#define GRACKLE_DOZE	(1<<5)
#define	GRACKLE_NAP	(1<<4)
#define	GRACKLE_SLEEP	(1<<3)

int __openfirmware powerbook_sleep_G3(void)
{
	unsigned long save_l2cr;
	unsigned long wait;
	unsigned short pmcr1;
	struct adb_request req;
	int ret, timeout;
	struct pci_dev *grackle;

	grackle = pci_find_slot(0, 0);
	if (!grackle)
		return -ENODEV;

	/* Notify device drivers */
	ret = broadcast_sleep(PBOOK_SLEEP_REQUEST, PBOOK_SLEEP_REJECT);
	if (ret != PBOOK_SLEEP_OK) {
		printk("pmu: sleep rejected\n");
		return -EBUSY;
	}

	/* Sync the disks. */
	/* XXX It would be nice to have some way to ensure that
	 * nobody is dirtying any new buffers while we wait.
	 * BenH: Moved to _after_ sleep request and changed video
	 * drivers to vmalloc() during sleep request. This way, all
	 * vmalloc's are done before actual sleep of block drivers */
	fsync_dev(0);

	/* Give the disks a little time to actually finish writing */
	for (wait = jiffies + (HZ/2); time_before(jiffies, wait); )
		mb();

	/* Sleep can fail now. May not be very robust but useful for debugging */
	ret = broadcast_sleep(PBOOK_SLEEP_NOW, PBOOK_WAKE);
	if (ret != PBOOK_SLEEP_OK) {
		printk("pmu: sleep failed\n");
		return -EBUSY;
	}

	/* Wait for completion of async backlight requests */
	while (!bright_req_1.complete || !bright_req_2.complete ||
		!bright_req_3.complete || !batt_req.complete)
		pmu_poll();
	
	/* Turn off various things. Darwin does some retry tests here... */
	pmu_request(&req, NULL, 2, PMU_POWER_CTRL0, PMU_POW0_OFF|PMU_POW0_HARD_DRIVE);
	while (!req.complete)
		pmu_poll();
	pmu_request(&req, NULL, 2, PMU_POWER_CTRL,
		PMU_POW_OFF|PMU_POW_BACKLIGHT|PMU_POW_IRLED|PMU_POW_MEDIABAY);
	while (!req.complete)
		pmu_poll();

	/* Disable all interrupts */
	pmac_sleep_save_intrs(-1);

	/* Make sure the PMU is idle */
	while (pmu_state != idle)
		pmu_poll();

	/* Make sure the decrementer won't interrupt us */
	asm volatile("mtdec %0" : : "r" (0x7fffffff));
	/* Make sure any pending DEC interrupt occuring while we did
	 * the above didn't re-enable the DEC */
	mb();
	asm volatile("mtdec %0" : : "r" (0x7fffffff));
	
	/* Giveup the FPU */
	if (current->thread.regs && (current->thread.regs->msr & MSR_FP) != 0)
		giveup_fpu(current);

	/* We can now disable MSR_EE */
	cli();

	/* For 750, save backside cache setting and disable it */
	save_l2cr = _get_L2CR();	/* (returns 0 if not 750) */
	if (save_l2cr)
		_set_L2CR(0);

	/* Ask the PMU to put us to sleep */
	pmu_request(&req, NULL, 5, PMU_SLEEP, 'M', 'A', 'T', 'T');
	while (!req.complete)
		pmu_poll();

	/* The VIA is supposed not to be restored correctly*/
	save_via_state();
	/* We shut down some HW */
	pmac_call_feature(PMAC_FTR_SLEEP_STATE,NULL,0,1);

	pci_read_config_word(grackle, 0x70, &pmcr1);
	/* Apparently, MacOS uses NAP mode for Grackle ??? */
	pmcr1 &= ~(GRACKLE_DOZE|GRACKLE_SLEEP); 
	pmcr1 |= GRACKLE_PM|GRACKLE_NAP;
	pci_write_config_word(grackle, 0x70, pmcr1);

	/* Call low-level ASM sleep handler */
	low_sleep_handler();

	/* We're awake again, stop grackle PM */
	pci_read_config_word(grackle, 0x70, &pmcr1);
	pmcr1 &= ~(GRACKLE_PM|GRACKLE_DOZE|GRACKLE_SLEEP|GRACKLE_NAP); 
	pci_write_config_word(grackle, 0x70, pmcr1);

	/* Make sure the PMU is idle */
	pmac_call_feature(PMAC_FTR_SLEEP_STATE,NULL,0,0);
	restore_via_state();
	
	/* Restore L2 cache */
	if (save_l2cr)
 		_set_L2CR(save_l2cr);
	
	/* Restore userland MMU context */
	set_context(current->active_mm->context, current->active_mm->pgd);

	/* Power things up */
	pmu_request(&req, NULL, 2, PMU_SET_INTR_MASK, 0xfc);
	while (!req.complete)
		pmu_poll();
	pmu_request(&req, NULL, 2, PMU_POWER_CTRL0,
			PMU_POW0_ON|PMU_POW0_HARD_DRIVE);
	while (!req.complete)
		pmu_poll();
	pmu_request(&req, NULL, 2, PMU_POWER_CTRL,
			PMU_POW_ON|PMU_POW_BACKLIGHT|PMU_POW_CHARGER|PMU_POW_IRLED|PMU_POW_MEDIABAY);
	while (!req.complete)
		pmu_poll();

	/* ack all pending interrupts */
	timeout = 100000;
	interrupt_data[0] = 1;
	while (interrupt_data[0] || pmu_state != idle) {
		if (--timeout < 0)
			break;
		if (pmu_state == idle)
			adb_int_pending = 1;
		via_pmu_interrupt(0, 0, 0);
		udelay(10);
	}

	/* reenable interrupt controller */
	pmac_sleep_restore_intrs();

	/* Leave some time for HW to settle down */
	mdelay(100);

	/* Restart jiffies & scheduling */
	wakeup_decrementer();
	sti();

	/* Notify drivers */
	broadcast_wake();

	return 0;
}

int __openfirmware powerbook_sleep_Core99(void)
{
	unsigned long save_l2cr;
	unsigned long wait;
	struct adb_request req;
	int ret, timeout;
	
	if (!can_sleep) {
		printk(KERN_ERR "Sleep mode not supported on this machine\n");
		return -ENOSYS;
	}
	
	/* Notify device drivers */
	ret = broadcast_sleep(PBOOK_SLEEP_REQUEST, PBOOK_SLEEP_REJECT);
	if (ret != PBOOK_SLEEP_OK) {
		printk("pmu: sleep rejected\n");
		return -EBUSY;
	}

	/* Sync the disks. */
	/* XXX It would be nice to have some way to ensure that
	 * nobody is dirtying any new buffers while we wait.
	 * BenH: Moved to _after_ sleep request and changed video
	 * drivers to vmalloc() during sleep request. This way, all
	 * vmalloc's are done before actual sleep of block drivers */
	fsync_dev(0);

	/* Give the disks a little time to actually finish writing */
	for (wait = jiffies + HZ; time_before(jiffies, wait); )
		mb();

	/* Sleep can fail now. May not be very robust but useful for debugging */
	ret = broadcast_sleep(PBOOK_SLEEP_NOW, PBOOK_WAKE);
	if (ret != PBOOK_SLEEP_OK) {
		printk("pmu: sleep failed\n");
		return -EBUSY;
	}
	/* Wait for completion of async backlight requests */
	while (!bright_req_1.complete || !bright_req_2.complete ||
		!bright_req_3.complete || !batt_req.complete)
		pmu_poll();

	/* Tell PMU what events will wake us up */
	pmu_request(&req, NULL, 4, PMU_POWER_EVENTS, PMU_PWR_CLR_WAKEUP_EVENTS,
		0xff, 0xff);
	while (!req.complete)
		pmu_poll();

	pmu_request(&req, NULL, 4, PMU_POWER_EVENTS, PMU_PWR_SET_WAKEUP_EVENTS,
		0, PMU_PWR_WAKEUP_KEY |
		(option_lid_wakeup ? PMU_PWR_WAKEUP_LID_OPEN : 0));
	while (!req.complete)
		pmu_poll();
		
	/* Save & disable all interrupts */
	openpic_sleep_save_intrs();

	/* Make sure the PMU is idle */
	while (pmu_state != idle)
		pmu_poll();

	/* Make sure the decrementer won't interrupt us */
	asm volatile("mtdec %0" : : "r" (0x7fffffff));
	/* Make sure any pending DEC interrupt occuring while we did
	 * the above didn't re-enable the DEC */
	mb();
	asm volatile("mtdec %0" : : "r" (0x7fffffff));

	/* Giveup the FPU & vec */
	enable_kernel_fp();

#ifdef CONFIG_ALTIVEC
	if (cur_cpu_spec[0]->cpu_features & CPU_FTR_ALTIVEC)
		enable_kernel_altivec();
#endif /* CONFIG_ALTIVEC */

	/* We can now disable MSR_EE */
	cli();

	/* For 750, save backside cache setting and disable it */
	save_l2cr = _get_L2CR();	/* (returns 0 if not 750) */
	if (save_l2cr)
		_set_L2CR(save_l2cr & 0x7fffffff);

	/* Save the state of PCI config space for some slots */
	//pbook_pci_save();

	if (!__fake_sleep) {
		/* Ask the PMU to put us to sleep */
		pmu_request(&req, NULL, 5, PMU_SLEEP, 'M', 'A', 'T', 'T');
		while (!req.complete && pmu_state != idle)
			pmu_poll();
	}

	out_8(&via[B], in_8(&via[B]) | TREQ);
	wait_for_ack();

	/* The VIA is supposed not to be restored correctly*/
	save_via_state();

	/* Shut down various ASICs. There's a chance that we can no longer
	 * talk to the PMU after this, so I moved it to _after_ sending the
	 * sleep command to it. Still need to be checked.
	 */
	pmac_call_feature(PMAC_FTR_SLEEP_STATE,NULL,0,1);